Qur'an 51:23

فَوَرَبِّ ٱلسَّمَآءِ وَٱلْأَرْضِ إِنَّهُۥ لَحَقٌّ مِّثْلَ مَآ أَنَّكُمْ تَنطِقُونَ

“Then by the Lord of the heaven and earth, indeed, it is truth - just as [sure as] it is that you are speaking.”

Adh-Dhaariyat 51:23 · Saheeh International